公开(公告)号：US11258995B2

公开(公告)日：2022-02-22

申请号：US16664961

申请日：2019-10-28

Applicant: Qisda Corporation

Inventor： Chi-Jen Chen ,  Fang-Chieh Lu ,  Chun-Hsiao Lin

IPC: H04N9/31 ,  G03B21/20

Abstract: A projector and a drive circuit thereof are provided. The projector includes a light source and a drive circuit. The light source includes at least one red light diode, at least one green light diode, at least one first blue light diode and at least one second blue light diode. The drive circuit includes a red light drive circuit, a green light drive circuit, a first blue light drive circuit and a second blue light drive circuit. The green light drive circuit outputs a green light drive signal to the green light diode according to a green light control signal. The second blue light drive circuit outputs a second blue light drive signal to the second blue light diode according to a second blue light control signal. The second blue light control signal and the green light drive signal have synchronous pulse.

公开(公告)号：US10091473B1

公开(公告)日：2018-10-02

申请号：US15704009

申请日：2017-09-14

Applicant: QISDA CORPORATION

Inventor： Chi-Jen Chen ,  Chun-Hsiao Lin ,  Fang-Chieh Lu ,  Chuan-Chu Chen

IPC: H04N9/31 ,  G03B21/00

Abstract: A driver circuit includes a first voltage converter, a light source driver, a second voltage converter and a control circuit. The first voltage converter converts a first voltage to a second voltage. The light source driver is coupled to the first voltage converter, converts the second voltage to a third voltage and outputs the third voltage to a light source for providing light. The second voltage converter is coupled to the first voltage converter, converts the second voltage to a fourth voltage and outputs the fourth voltage. The control circuit is coupled to the second voltage converter to receive the fourth voltage and outputs a first control signal to control the light source driver for controlling the light source. The first voltage is lower than the second voltage, the second voltage is higher than the third voltage, and the second voltage is higher than the fourth voltage.

公开(公告)号：US10816888B1

公开(公告)日：2020-10-27

申请号：US16830442

申请日：2020-03-26

Applicant: Qisda Corporation

Inventor： Chi-Jen Chen ,  Fang-Chieh Lu ,  Chun-Hsiao Lin

IPC: G03B21/20 ,  H05B45/12 ,  H05B45/22 ,  H05B41/02 ,  H05B33/08

Abstract: A power control circuit for a projector for controlling a light source of the projector. The power control circuit includes: a detector for detecting an AC input voltage is a first value or a second value; a switch coupled to the detector, conducting or disconnecting of the switch being based on the detector detecting whether the AC input voltage is the first value or the second value, the switch further outputting a first control signal; and a laser driver coupled to the switch and the light source, in response the first control signal from the switch to change power consumption of the light source. When the AC input voltage is the first value, power consumption of the light source is a default value. When the AC input voltage is the second value, power consumption of the light source decreased from the default value.